An anchor portal or H-frame tower is a gantry structure supporting overhead power lines in a switchyard. Their static function is similar to a dead-end tower. Anchor portals are almost always steel-tube or steel-framework constructions.
Gallery
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Power line Morales1.jpg|A simple H-frame anchor tower consisting of two poles and one horizontal crossarm, bearing similarity to the letter H
Abspannmast_Abspannportal.jpg|anchor pylon and anchor portal, 380kV
UW-Birkenfeld_Abspannportal.jpg|anchor gantry, 110kV
UW_Seewiesen_Zuleitung.jpg|diagonal frame
Huge gantry tower in Golczewo.jpg|Multi-level gantry tower
Mastportal Pszenno.png|Gantry tower with road underneath
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